Agro-industrial by-products are the main sources of special wastes. In the Mediterranean area these wastes are mainly related to cereals, grapes and olives transformations; in fact, in 2004, the Italian production was 22,1 millions Tons, 8 millions Tons and 4,7 million Tons, respectively. In particular, the Italian wine industry shows a large production of vinasse (1 millions Tons) that is today used to produce bioethanol. However these wastes still contain over than 30000 Tons of polyphenols, characteristic phenolic compounds of vegetables, which could be recovered as high added value chemicals. Biophenols are known for their bioactivities and antioxidant properties useful in several fields such as cosmetics, cosmetoceutic, nutraceutic and food industry. A new approach of Integrated process of waste Valorisation, including the recovery of the phenolic fraction, would lead to a more sustainable process from the environmental and the economical point of view. Preliminary process of a selective recovery of biophenols from grape skin using an adsorption/desorption patented technology was performed on a model system of oenocyanin, a natural extract of red grape skins mainly constituted of phenols, solubilised in water up to a concentration close to its solubility (co-pigmentation) limit (54 g/l), in order to simulate an aquose extract of vinasse or a liquid residue from wine/ethanol production. This technology was already gotten in ready for the recovery of biophenols from olive oil milling waste water during an European Project FAIR CT 97 3039 “Natural antioxidants from olive milling process”. The technology, hereby described, was proved to be effective, scalable, relatively cheap and flexible. The adsorption step was performed with anionic exchange resins and the consequent recovery of the total phenols and anthocyanosides from the model system was >90%. The desorption step was instead performed in solutions containing different percentage of water in ethanol, all added with 1% of concentrated HCl. With all the extracting solution tested the desorption yield were good, 40-50% for anthocyanosides, 70-85% for phenols. Using acidic ethanol:water 40:60 as extraction solvent we obtained the higher overall yield > 80%. The extraction solvent can be then used in order to enrich the phenolic mix in antocyanosydes. These preliminary results demonstrate that the extraction technology based on polymeric resins could be a feasible tool in order to build up an integrated valorisation process environmentally and economically sustainable.
E. Ansaloni, F. Carloni, D. Zanichelli, A. Filippini, L. Setti (2006). Recovery of phenols from grape skin: preliminary studies on model system. MADRID : IFEMA.
Recovery of phenols from grape skin: preliminary studies on model system
ZANICHELLI, DARIO;SETTI, LEONARDO
2006
Abstract
Agro-industrial by-products are the main sources of special wastes. In the Mediterranean area these wastes are mainly related to cereals, grapes and olives transformations; in fact, in 2004, the Italian production was 22,1 millions Tons, 8 millions Tons and 4,7 million Tons, respectively. In particular, the Italian wine industry shows a large production of vinasse (1 millions Tons) that is today used to produce bioethanol. However these wastes still contain over than 30000 Tons of polyphenols, characteristic phenolic compounds of vegetables, which could be recovered as high added value chemicals. Biophenols are known for their bioactivities and antioxidant properties useful in several fields such as cosmetics, cosmetoceutic, nutraceutic and food industry. A new approach of Integrated process of waste Valorisation, including the recovery of the phenolic fraction, would lead to a more sustainable process from the environmental and the economical point of view. Preliminary process of a selective recovery of biophenols from grape skin using an adsorption/desorption patented technology was performed on a model system of oenocyanin, a natural extract of red grape skins mainly constituted of phenols, solubilised in water up to a concentration close to its solubility (co-pigmentation) limit (54 g/l), in order to simulate an aquose extract of vinasse or a liquid residue from wine/ethanol production. This technology was already gotten in ready for the recovery of biophenols from olive oil milling waste water during an European Project FAIR CT 97 3039 “Natural antioxidants from olive milling process”. The technology, hereby described, was proved to be effective, scalable, relatively cheap and flexible. The adsorption step was performed with anionic exchange resins and the consequent recovery of the total phenols and anthocyanosides from the model system was >90%. The desorption step was instead performed in solutions containing different percentage of water in ethanol, all added with 1% of concentrated HCl. With all the extracting solution tested the desorption yield were good, 40-50% for anthocyanosides, 70-85% for phenols. Using acidic ethanol:water 40:60 as extraction solvent we obtained the higher overall yield > 80%. The extraction solvent can be then used in order to enrich the phenolic mix in antocyanosydes. These preliminary results demonstrate that the extraction technology based on polymeric resins could be a feasible tool in order to build up an integrated valorisation process environmentally and economically sustainable.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
